As part of the Expansion Pass DLC, an EX Treasure Chest appears atop a wall in the Eastern Abbey near the Ja Baij Shrine. Link must be careful as there is a Decayed Guardian nearby. Link can find the Nintendo Switch Shirt inside this chest. This shirt is a unique piece of armor, which can only be obtained once per save file and Link cannot get it back if he sells it. Sayge will also refuse to dye it if Link tries to dye it at the Kochi Dye Shop and it cannot be upgraded. Sayge claims that the shirts is made of a fabric that prevents dying. The shirt itself is mostly cosmetic as it only increases Link's defense by 1 and grants no special bonuses.

Gallery

Link wearing the Nintendo Switch Shirt

Link obtaining the Nintendo Switch Shirt from its EX Treasure Chest in the Eastern Abbey